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Warmup-1 > front3
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Given a string, we'll say that the front is the first 3 chars of the string. If the string length is less than 3, the front is whatever is there. Return a new string which is 3 copies of the front.

front3("Java") → "JavJavJav"
front3("Chocolate") → "ChoChoCho"
front3("abc") → "abcabcabc"

...Save, Compile, Run (ctrl-enter)

public String front3(String str) { }

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